and man in china went into a school with a knife and stabbed 22 children. almost all of them but one survived because it was a knife and not a gun. >> it seems obvious, but maybe it is worth saying, a gun be sh. in an attack with a gun, it also means other people are less likely to intervene. there are many reasons why an attack with a gun is more lethal than an attack with a knife. and that is why, specifically, strong roles are justified to have on a weapon that is specifically made for killing >> rebecca, we only have a few questions. onlhave many the conceal and carried it, a new law that says students can carry on campus and teachers are afraid of giving students a bad grade. i know you have looked at other countries outside australia. how powerful in australia was the gun lobby? look at the nra. they are hiding their heads right now. their facebook pages down. this is a particular moment when the legislation is actually debated. we will see what happens. >> the gun lobby was very powerful in australia at the time, but the combination of public opinion